. >> police were tipped off when the man the teacher allegedly tried to hire informed authorities. the f.b.i. soon got involved. and in one taped conversation with an undercover aged two weeks ago he allegedly said he had an issue he might need taken care of and that he would be willing to pay $2,000. when he wouldn't agree to meeting in person police felt there was enough evidence and moved in. abc news has learned he was transferred last year because he wasn't getting along with his former coworkers. in 28 years of teaching the most serious blemish on his record happened back in 2001 when he was suspended. >> there was an incident where he created a stir in a staff meeting apparently he was acting aggressively and had some complaints that were inappropriate. >> coming up how a disguise helping one target victims at an unlikely place to be ripped off. and the case closed surrounding a chemist at the center of a massive lab scandal. we'll be right back. krystal conwell : we see a lot of problems with the... number of students that we have. resources.